The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1993
Filed:
Aug. 23, 1991
Hiroyuki Motegi, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A variable delay circuit delays an input signal by an amount corresponding to a control signal. A signal delay amount of the variable delay circuit is detected by a delay amount detector circuit, and the detection signal is supplied to a charge pump circuit. In the charge pump circuit 12, a DC voltage according to a pulse width ratio of the input signal to an detection output from the delay amount detector circuit is generated and fed back to the variable delay circuit as the control signal. A predetermined DC voltage output from an initial voltage setting circuit is applied to a path of the control signal output from the charge pump circuit 12. An output voltage from the initial voltage setting circuit is set to be an approximate value of a value such that a desired delay amount is obtained in each of delay stages of the variable delay circuit, and the initial voltage setting circuit sets an initial value of the control signal.